Isc/G linearization

In the flash-tests measurements, the different irradiances are obtained by filters. The accuracy of the relative efficiency measurement is directly linked to the accuracy of the filter: an error of 1% on the filter calibration leads to an error of 1% in the relative efficiency.

This graph shows the ISC / G ratio, from these measurements.

We can observe that the values are rather well aligned, except for 100 W/m2 which shows an over-performance of almost 4%. This has a big impact on the low-light adjustment, by pulling the low-light efficiencies up.

We may evaluate the Irradiance measurement errors by supposing that the ISC is quite proportional to the irradiance. The button Linearize ISC/G will adjust the GRef of each measured point, in order to get a perfectly linear ISC/G ratio. In this example, this will define a GRef of around 104 W/m² for the first point.